Maximum-hand for indicating devices.



B. VOLKMAR.

MAXIMUM HAND FOR INDIGATING DEVICES.

APPLICATION FILED 0012.14.1909.

989,088, Patented Apr. '11, 1911.

I In. a I 5 54 @f 5 3 11 2 I 354-6 O 29 J I nven 601*.

, mechanism that its actuation will cause a I the indicating hand.

borough of the Bronx, city of New York,

" cause a drag or retardation to the advance hand in engagement with themaximum UNITED sra'rns PATENT carton.

IBERNHARD VOLKMAR,

OF NEW YORK, N. Y., ASSIGNOR,-BY MESNE ASSIGNMENTS. TO CONRAD HUBERT, OFNEW YORK, N. Y.

MAXIMUM-HAND FOR INDICATING DEVICES.

To all whom it may concern:

Be it known that I, BERNIIARD Vomnmn, a citizen. of the United States,residing; at the in the county of New York and State of New York. have.invented certain new and useful Improvements in Maximnm-Ilamls forIndicating Devices, of which the following is a specification, referencebeinghad therein to the accompanying drawings, forming part thereof.

My invention relates to indicating devices, particularly tospeedindWatiug dcvicesor speedometers and has for an obyect to providesimple and reliable means forexlubib ing the maximum indication of thedevice.

As a meansfor eilj'ecting this indication there is commonly employed,beside the usual index or indicating, hand, an additional hand known asa maximum hand.which is advanced with the indicatinghand to the maximumindications and remains there when the indicating hand recedes. Toadvance the maximum hand with the indicating hand, a lug or linger iscommonly placed on the indicating hand adapted to catch the maximum handand carry it along, but this method of advancing the maximum hand hasbeen found to be disadvantageous and to of the ii'idicating hand. Asaportion of the indications are given with the indicating hand and theremainder of the indications are given with the indicating handdisengaged from the maximum hand, the retardation by the maximum handproduces an objectionable inaccuracy of indication.

One object of my invention is to so con nect the maximum hand to theoperating minimum of retardation to the actuation of Other objects aresimplicity of construction and firmness of connection and reliability ofoperation.

Other objects and advantages of my inven tion will appear from thefollowing description.

I shall now describe my invention with reference to the acconmanyingdrawings and shall thereafter point out my invention in claims.

Figure l is a front elevation, partly in section, of a complete deviceembodying my in- Specificatioa of Letters Patent.

Application filed October 14,

Patented Ap r. 11, 1911'.

1909. Serial No. 522,606.

vention. Fig.2 is a detail in side elevation of the two hands and theirdriving mechanism, with the supporting plates in section. Fig. 3 is asectional detail taken on the line 3-3 of Fig. 2 looking; toward theright.

For a concrete illustration 1. have shown an embodiment of my inventionin connection with a speed indicator such as is described in UnitedStates Letters Patent No. 813,185, granted to me l eln'uary 20, 1906,though it is well adapted for use in connection with a great variety ofconstructions of speed indicators.

vMy invention broadly consists in driving the maximum hand directly fromthe operating mechanism of the indicator instead-of indirectly throughthe indicating hand, thereby giving a maximum advantage in theapplication of the power; and T have proved. by actual tests that thismethod ofactuating the maximum hand produces negligible retardation totheadvancc of thc indicating hand. V

In the illustrated (anl'lodilnent, l have shown an indicating hand 4-fixed on the outer end ot a main arbor and a maxinnnn hand 6 pivoted onthe arbor so as to move in a plane in rear of the indicating hand 4, and

fixed on the outer end of acarrier or sleeve 7 on the arbor Fastencd onthe inner end of the sleeve 7 and concentric therewith is a pinion 8 anda ratchet wheel 9, the latter in proximity to a plate 10, which issupported a slight distance in front of and parallel to another plate11; and the arbor 5 extends through bearings in both the front and backplates. A pinion 12.is fastened on the arbor 5 concentric therewithbetween the plates 10 and 11. and bears against the front of the backplate 1] and a collar 13 on the arbor 5 bears against. the rear side ofthe front plate 10 to hold the arbor against. outward longitudinalmovement. i

To rotate the arbor 5 and hence the indicating hand at, a gear wheel l-lmeshes with the pinion 12 and is mounted on a stud 15 on the plate 11which extends some distance through and in front of the plate 10, asshown. To rotate the gear wheel 14- a roller crank arm lt' is providednear the periphery of the gear wheel of suflicient length to bear uponthe face of a cone 1?. llhecone 17 is mounted on a shaft 18 and isadapted to slide longitudinally of the shaft and is linked (the link notbeing shown) to a. governor ring 19, as in my -patent above referred to.through the governor ring 19, and the governor ring is mounted on adiametral pivot pin which passes. through the shaft 18. A spring :21 iscoiled around the pivot pin 20 and bears with one end against a pin 22rotated, therefore,

extending across the governor ring, and with the other against the shaft18 and tends to hold the governor ring in an inclined position. Theshaft 18 is rotated by the movement of the vehicle and the governor ringis rotated by the shaft, and the centrifugal force tends to cause thegovernor ring to assume a horizontal position. The lower end of the ring"is thus raised and, being linked to the cone 17, carries the cone upwith it. By this upward movement, the cone presses the crank arm 16outwardly and rotates the gear wheel 14-, which in turn rotates thepinion 12, and the hand 4 is thus swung over the dial of the indicator,its range of movement being from zero at the left to the maximum speedindication at the right. As the centrifugal force decreases with thespeed, the spring 21 returns the governor ring to its original position,and to cause the crank arm 16 to follow up the face of the cone androtate the gear wheel 14 back as the cone is moved down by the, governorring, a retractile spring 23 is coiled about a sleeve 24 on the stud 15,this sleeve being fastened to the gear wheel. 14, one end of the springbearing against the coller 13 on the arbor 5 and theother end fastenedto the gear wheel. When the gear wheel is rotated to advance theindicatin hand, the spring is wound up, and when the cone recedes, thespring unwinds and holds the arm 16 against the face of the cone. Thusthe indicating hand is swung back in proportion to the decrease inspeed.

As previously stated, my invention comprises means for driving themaximum hand directly from the operating mechanism, and as a means fordoing this I have shown a segment or segmental gear wheel 25 alsopivoted onthe stud 15, but in front of the front plate 10, and adaptedto mesh with the maximum hand pinion 8. To hold the segment in the planeof the pinion 8, a collar 26 is provided on the stud 15 back of thesegment, and a sleeve 27 'on the stud 15 in, front of the segment isfastened to the segment and bears against a head 28 on the front end pfthe stud 15. To drive the segment 25 with the gear wheel 14, there is anelongated hole 29 in the front plate 10 between the segment 25 and thegear; wheel 14:,

and an abutment pin 30 on the wheel extends forward through the hole? 29and engages the segment 25 on the right side as shown in Fig. 1. As thegear wheel 11' is in a counter-'clock-wise direction as viewed in Fig.l, by the raising The shaft 18 passes centrally relieved of its burden,

A retractile spring 32, coiled about the sleeve 27 and having one endbearing against the maximum hand sleeve 7- and the other fastened to thesegment 25, tends to rotate the segment back and return the maximum handto alinement with the indicating hand. To hold the maximum hand in anyposition to which it is advanced, when the speed is reduced and the gearwheel 14 carries a pin.

30-away from the segment, a pawl 33 is pivoted on a lug on the plate 10and held by a spring 34 in engagement with the ratchet 9. To release thepawl 33 and permit the maximum hand to be retracted into alinement withthe indicating hand, a plunger 35 is provided, normally held by a springout of contact with the rear end. of the pawl, and adapted to be presseddown against the tension of the spring to release the pawl; The lowerend of the sleeve in which. the plunger slides is cam faced and a stoppin 36 on the plunger bears against the camface. Therefore a half turnof the plunger brings the pin 36 on the lowest part of the camface andholds the plunger against the pawl 33, thus providinga permanenthold-off for the pawl when it is desired to dispense with the indicationof the maximum hand.

To easily distinguish the maximum hand, it may be made of somedistinctive shape or color. Due to the rigidity of the abutment pin 30,the maximum hand is given a steady drive and, since the flexibleindicating hand the indications are made quickly and positively.

It'is obvious that various modifications may be made in the constructionshown and above particularly described within the prin' ciple and scopeof my invention.

' I claim:

1. In an indicating. device, an indicating hand and a maximum handmounted substantially co-axially, driving means for the indicating hand,separate driving means for the maximum hand, means for actuating theindicating-hand driving means, and means operated by said actuatingmeans for actuating the maximum-hand driving means.

2. In an indicating device, an arbor, a carrier surrounding the arbor,an indicating hand and a. maximum hand, one of the hands being mountedon the arbor and the other on the carrier surrounding the arbor,separate driving means for each hand, means for actuating theindicating-hand driving means, and means operated by said actuatin meansfor actuating the maxlmum-hand driving means.

;ing

3. In an indicating device, an arbor, a carrier surrounding the arbor,an indicat-' ing hand and a maximum hand, one of the hands being mountedon the arbor and the other on the carrier surrounding the arbor,separate driving means for each hand, means for actuating theindicating-hand driving means, and means on said actuating means foractuating the maximum-hand driving means to drive the maximum hand onlyin the direction of movement from a lower to a higher denomination.

4. In an indicating device, in combination with operating mechanism, anindicatin hand and a maximum hand, indicating hand driving meansoperatively connecting the indicating hand to the operating mechanism,

hand driving means indeand maximum pendent of the indicating hand drlvmgmeans and operatively connecting the maxi-' mum hand to the operatingmechanism, the maximum hand driving means being adapted to be operativewhen the two hands are giving like indications and to be inoperativewhen the maximum hand is in advance of the indicatin hand. i

5. In an indicating device, operating mech' anism, an indicating handactuated thereby, amaximumhand, means for transmitting motion directlyfrom the operating mechanism to the maximum hand at the same rate as theindicating hand, but only in the direction of movement from aindication, means constantly tending to return the maximum hand, meansfor retainthe maximum hand in any position in lower to a higher isignature advance of the indicating hand, and means for releasing theretaining means to permit the maximum hand to return.

6. In an indicating device, operating mechanism, a main arbor, a carriersurroundin the main arbor, an indicating hand mounted on the main arbor,a maximum hand mounted on the carrier, a pinion having fixed connectionwith the carrier, a. eared driving member cooperative with tie pinion,an actuating member for the main "arbor driven by the operatingmechanisn'i, and means on the actuating member for enga ing andactuating the geared driving mem er.

7. In an indicating device, operating mechanism, a main arbor, a carriersurroundin the main arbor, an indicating hand mountec on the main arbor,a maximum hand mounted on the carrier, a pinion having fixed connectionwith the carrier, at geared driving member cooperative with the pinion,an actuating member for the main arbor driven by the operatingmechanism, meanson the actuating member for engaging and actuating thegeared driving member only in the direction of movement from a lower toa higher indication, means constantly tending to return the. maximumhand, means for retaining the maximum hand in any position in advance ofthe indicating hand, and means for releasing the retaining means topermit the maximum hand to return.

In testimony whereof I have aflixed my in presence of two witnesses.

B ERNIIARD VOLKMAR. \Vitnesses:

Vnrron 1). House, BERNARD COWEN.

